Running ultimate. I went to start Photoshop, which worked fine last night, and got an error which basicly said it couldn't start due to lack of available memory....... nothing else is running, nothing that would use 2+GB's of mem anyway. so I went to the resource monitor to find that over half my memory is being used to cache stuff that isn't being used. how do i stop this or at least flush it without having to reboot my system?